Jakub K. Kominiarczuk Kai Krajsek Rudolf Mester Highly Accurate Orientation Estimation using Steerable Filters. 277-280 2007 ICIP (5) http://dx.doi.org/10.1109/ICIP.2007.4379819 conf/icip/2007 db/conf/icip/icip2007-5.html#KominiarczukKM07